1121722020 has 72 divisors (see below), whose sum is σ = 3528592704. Its totient is φ = 299124576.

The previous prime is 1121722003. The next prime is 1121722087. The reversal of 1121722020 is 202271211.

It is a happy number.

It is a super-3 number, since 3×1121722020³ (a number of 28 digits) contains 333 as substring.

It is a Harshad number since it is a multiple of its sum of digits (18).

It is a junction number, because it is equal to n+sod(n) for n = 1121721984 and 1121722002.

It is an unprimeable number.

It is a polite number, since it can be written in 23 ways as a sum of consecutive naturals, for example, 110544 + ... + 120263.

It is an arithmetic number, because the mean of its divisors is an integer number (49008232).

Almost surely, 2^1121722020 is an apocalyptic number.

1121722020 is a gapful number since it is divisible by the number (10) formed by its first and last digit.

It is an amenable number.

1121722020 is an abundant number, since it is smaller than the sum of its proper divisors (2406870684).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

1121722020 is a wasteful number, since it uses less digits than its factorization.

1121722020 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 230831 (or 230817 counting only the distinct ones).

The product of its (nonzero) digits is 112, while the sum is 18.

The square root of 1121722020 is about 33492.1187744221. The cubic root of 1121722020 is about 1039.0307846554.

Adding to 1121722020 its reverse (202271211), we get a palindrome (1323993231).

The spelling of 1121722020 in words is "one billion, one hundred twenty-one million, seven hundred twenty-two thousand, twenty".